Re: DB Sizing and init parameters

Unfortunately it isn't that simple. Other factors, primarily based around
the purpose of the database play a big role in many parameters. For
example, the sort_area_size is determined by the number and size of sort
operations which will be performed. An OLTP system will typically have a
much smaller sort area than a warehousing application. The number of open
cursors will depend heavily on the maximum number of concurrent users
connecting to the system. Also, many parameters can be tuned over time in
response to particular performance problems and therefore don't need a lot
of attention initially.

So, the values for init.ora parameters is unfortunately much more complex
than simple database size. Having said that, if you have accurate sizing
information then you quite possibly have a lot of the other information you
will require, such as concurrent users, etc. You can search the web for
various rules and guidelines for each individual parameter. Be careful
that the guidelines are appropriate for the version of Oracle you will be
working with - rules change over time.

I'd start with the parameters that cannot be easily changed - block size
immediately comes to mind. At least things like sort_area_size can be
changed later on if you notice a performance problem.

If we have done the DB Sizing for a particular database, Can we arrive
upon the initialization parameters for that database ? If so, Can
someone help me in attaining the formula or relation of these the
parameters based on the db sizing.

Thanks and Regards,
Pradeep

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